Herschel looks back in time to see today's stars bursting into life

Dec 17, 2010

An artist's rendition of one of the newly discovered SPIRE 'hot starburst' galaxies (credit: NASA/CXC/M.Weiss)

(PhysOrg.com) -- An international team of astronomers have presented the first conclusive evidence for a dramatic surge in star birth in a recently discovered population of massive galaxies in the early Universe.

The scientists used the European Space Agency's Herschel Space Observatory, an infrared telescope with a mirror 3.5 m in diameter, launched in 2009. They studied the distant objects in detail with the Spectral and Photometric Imaging Receiver (SPIRE) camera, obtaining solid evidence that the galaxies are forming stars at a tremendous rate and have large reservoirs of gas that will power the star formation for hundreds of millions of years.

Dr Scott Chapman from the Institute of Astronomy at the University of Cambridge, presents the new results in a paper in a special edition of the journal Monthly Notices of the Royal Astronomical Society focusing on results from Herschel.

"These Herschel-SPIRE measurements have revealed that a population of galaxies is hotter than expected, due to forming stars far more rapidly than we previously believed," he said.

The key to the new results is the recent discovery of a new type of extremely luminous galaxy in the early Universe. These galaxies are very faint in visible light, as the newly-formed stars are still cocooned in the clouds of of gas and dust within which they were born. This cosmic dust, which sits at around -232 C, is much brighter at the longer, far infrared wavelengths observed by the Herschel satellite.

A related type of galaxy was first found in 1997 (but not well understood until 2003) using the "SCUBA" camera attached to the James Clerk Maxwell Telescope on Hawaii, which detects radiation emitted at even longer sub-millimetre wavelengths. But these distant "sub-millimetre galaxies" were thought to only represent half the picture of star formation in the early Universe. Since SCUBA preferentially detects colder objects, it was suggested that similar galaxies with slightly warmer temperatures could exist but have gone largely unnoticed.

Dr. Chapman and others measured their distances using the Keck optical telescope on Hawaii and the Plateau de Bure sub-millimetre observatory in France, but were unable to show that they were in the throes of rapid star formation.

Herschel would be the first telescope with the capability to detect these galaxies at the peak of their output, so Dr. Chapman joined forces with the "HerMES" team, led by Professor Seb Oliver of the University of Sussex and Dr Jamie Bock in the Jet Propulsion Laboratory California, who were undertaking the largest survey of galaxies with Herschel.

With the Herschel observations, focused on around 70 galaxies in the constellation of Ursa Major the scientists acquired the missing piece of evidence to confirm that these galaxies represent a crucial episode in the build up of large galaxies around us today, such as our own Milky Way.

Team member Professor Rob Ivison from the University of Edinburgh said: "With the data we had before, we couldn't tell exactly where the infrared light from these galaxies comes from. But using SPIRE we can see that this is the signature of star formation."

The new galaxies have prodigious rates of star formation, far higher than anything seen in the present-day Universe. They probably developed through violent encounters between hitherto undisturbed galaxies, after the first stars and galaxy fragments had already formed. None the less, studying these new objects gives astronomers an insight into early epochs of star formation after the Big Bang.

Team colleague Dr Isaac Roseboom from the University of Sussex said: "It was amazing and surprising to see the Herschel-SPIRE observations uncover such a dramatic population of previously unseen galaxies." Professor Seb Oliver, also from Sussex, added: "We are really blown away by the tremendous capability of Herschel to probe the distant universe. This work gives us a real handle on how the cosmos looked early in its life."

With the new discovery, the UK-led astronomers have provided a much more accurate census of some of the most extreme galaxies in the Universe at the peak of their activity. Future observations will investigate the details of the galaxies' power source and try to establish how they will develop once their intense bursts of activity come to an end.

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User comments : 4

It really is impressive to think that an essentially inconsequential organism which developed on a presumeably relatively common planet in a non-descript suburb of a very average spiral galaxy could produce the sorts of astronomic observations we do.

it only took us a few hundred million years to evolve to that point ;-)Given the recent discovery that our universe could host up to 30 percent more, red dwarf stars, that got unnoticed due to their smaller size, temperature and being more obscured by dust, it all adds to the importance of looking at the full infrared spectrum to paint a complete picture.

The new galaxies have prodigious rates of star formation, far higher than anything seen in the present-day Universe.

It only makes sense that back in the time when the universe was much smaller and the only things out there were gas and dust clouds, that there must have been a time when stars started forming at the rate of microwave popcorn, literally. It's only once most of that material is already bound up in stars and far more spread out that the rate of star formation would slow to the present pace.

it only took us a few hundred million years to evolve to that point ;-)

But it's only in the last few decades that we've had the technology to do what we are now. The only reason I regret being a seasoned citizen is that I will not be around to see all the marvels and wonders we discover in the next fifty years. (That is of course unless we manage to extinct ourselves first.)

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